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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e97c793e4340207ec2f3f206120f5d9ef8949e47eb5c4e27eee526c5c1ba30' 
  AND token = 'QwYFXAydfkWqBUsS6tp2JUTScGV2Y6Ae73siS327TAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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