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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37609a962058a919970c6160d5e3282357f75fefc024f6ddba3ed912b553ce0' 
  AND token = 'Fzz7CuN7QcCvOlyp2rvsVxID/x6w0L6gVQ7lC5b3NyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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