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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b650263bc1a8aa9d8582aee85d94b73740ea80ebce6ea678e28a59ad8ab49137' 
  AND token = 'ppNuo7GE8XH36KZG267m5uKf7RsXU9W+0J0RPFZUebM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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