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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a53e99c86f122b7558506576ba3719f899cd0c21c557b37a2d75f0e23a78d9e' 
  AND token = 'p12gkfYnFoEmYD3wxfjDfm2lS4I2Cqu8ZpSiAV43288=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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