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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec9cb5ed86a062e36ba425ea04dbae02fbb6cfd4061ca7f79b7f11dd07dab64' 
  AND token = 'v0vuXK0HV/UB4GN/x8J38NxE4JX0gAdnfCfTZEfxF6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}