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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34529815a2e0907c877048f88d87cc66193d0c1400c7c8770641fb2469f1c70c' 
  AND token = 'VpSWZv/PdCjCBFs+f0MlHRyBmmZykZjziYHrHkBTOrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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