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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57be9cc1ca999dc348dfc0cda3bd54c238b5d548e79d46125183d702370dfae3' 
  AND token = 'OCrIhsF1bHA46Z0Sfar+fQmz3tNU0/Fp1K8NXvwyo+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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