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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25612bdfa833e14684c363fd51fbd63650d22cb3dc5df20629a9cae8ca77d025' 
  AND token = 'QieOQfxoeFvjTWp3MBNtJ3tfgduTpQ9j+ss+zXnui/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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