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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b53faf0919b85e4872f84b9d4d32ff4553d6aae06edbd83313bed29fd20d55a9' 
  AND token = 'aMelddZqlDOdB8oIjU+aICCscBO9h5WJHNbZVWQk0Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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