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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ca7d363ba1cf37b1a0342736c5034fd5b995d04dea98183327cc0e4164e21f' 
  AND token = 'muR0eUpc4NGq7Cq4glwqdY1z90eYN0iI87fQTpY28ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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