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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be59e58043e35139e9b54b4a7189b8f825db725c231786be31f7aa70dc11ea48' 
  AND token = 'Te2EKsnefb4vdvLAmWV0HAA2N06z3tWUuech7hLoW5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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