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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe89bb2f72b6d749d7c53bf905af9f89bbddbce112a74bdefc772cfb2288ee9a' 
  AND token = 'JAkSkBXl2A5djZ6M48ANXB+2810KOK9J2dmRyqVB6HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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