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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc4960e3259d732f0499b17ef7ab46a0b0d14d2bc47b1bf1bb51ec1af3ece04' 
  AND token = 'ZhT+aTTZfHfcKtHLtaoBQJm6cZJLBGNsOaOSnM+BQvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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