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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee31e1c6fa7634dbdf66813d9487d1a57037d243d873e7a931e844c6dfdbd9bd' 
  AND token = 'VCtnF2q8XedrX4+4Sf3cprlI6h56QPt9qmfQrMnOMQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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