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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf3fe8da17f00c25bb7777db388b0f4e7efdb348858b9ba6de1c0e4535cd08a' 
  AND token = 'kXcvMVzgy4EFkc5Hcwd1XDZwy4XhU1GtvfCtVd9Hbfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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