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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f56544acab2046a839e712ff0c58bb138fec63cb1bd7f45928e156d9424e54' 
  AND token = 'CEcrFfmjM6pDpy9On58NL4Fz3HPGlP8Py5n8YMURNZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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