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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f3018e968bc1234b707ad118c70dfc1fff60dc979b778912fc777e41336367' 
  AND token = 'AJ7nvntY1R9Lo0tHr3Mj7UJqxrKvGMxKgijHAEm4G2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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