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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e66ed5d74c9038a63e23bd0f9dec1d6d988b52e84e6559320cc77da96d255a' 
  AND token = '1Ekc7SYYDNh7EGnqTocq4vR5y8ymIEAt2hsI0Ca/oAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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