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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf368d87b3b7fbf88c15d3208c2b37cd2626400d3b9eb06aa4b5b616dc0868bf' 
  AND token = 'OAbIAUhzxd2NBAfmxM+zm2IT6JbAdkspL+pY3KUmcEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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