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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c534e2cd467ec5b6e79b0dde9a1620b10aa372839f5be3df0ab87fa619a93930' 
  AND token = 'FzEP5hkFQ98RMvdG4OWvjpv5KYRK7QlzYSFXYAiG8W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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