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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976b8ab94063284848b7d66ee0a6df3f5bfebbb1f4ab2c1e3344def49550e2cc' 
  AND token = '0U+OCppcq8YWG0Pc6zbvIbCnK2rlxJlfgffx9E1YA7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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