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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc28a060db6373a45fc5558d822cbc457ae7c09be9f47f8a9ddce923e537c36' 
  AND token = 'Fkj3l6nyMfUKcj3EAgApvMG9KsbYediVO2ML8Kvk0No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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