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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaac481a24cb6a7d0387ed365a76b4490a66d2178178bbbe072ce8c5e4887366' 
  AND token = 'CBip40glVrXwWpQKjAkvHZUG7XBjDNj/iyL8BWJrBy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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