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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f75822f95cd092897e23362f1cb18f213189d9e8d08226c5673880d1bc29d0' 
  AND token = 'FtzDnY8f9mhlQOTV3CFfdl8cm5SKxJJrGaaoP2MQlFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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