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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820c3546bfc08626bd1ab5967a219f6fa828e1bd040bd77a38f03c7422a491f3' 
  AND token = 'rakFcwXkixvglrtOs+7/NI+C1zR2E7IsUbI4kBSdlNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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