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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '458aa8df5558aa7b12088e4d0127b1c25cdb43db7d0077ec4ec7a92cd86aa5db' 
  AND token = 'UH/6jcQ6a6ZvzRfRZ4ePPV7aOuhdBcpdlP6hKKqbqn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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