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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887a20804b6411b2371da748288b678f89c66b9ded38ad2d3a2299dc403e92a9' 
  AND token = 'CkLEMCJEX3oWrDIn8sg7wZxK6DHGoSXG1weD8MGJw/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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