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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16586164efd4b119227f698801ea6f50c834dbaa7d60e3cac550b46122d6fb54' 
  AND token = '8rMGYEurFOW/fCNeQgDTHnbhlpwotvWix7X2/DI5EBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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