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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff1f103c2573651e88b4784b7a4ffb81a00e1099becf36bcd796946876363ab' 
  AND token = 'Rrk/8dSeD5Rk7SHPW7QhsKU/I2ALCbjBgKQnjSHo8rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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