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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1859c8a3bb421bb107d77cee03961419367978ed2bf4e5ca7e24c1ef200b694f' 
  AND token = '7xvI43ciZZDDYlEdIm95rupNtd+6nyDLKNihFr7hgXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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