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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8b0602eafdbb4f4d9a6d4b13ad6fe27115ad7b34659e17e02f52d41fe08169' 
  AND token = 'G/x3oRxPEi8KdtQf1HVUmMr2zubbrU9aqvvP6CBS3pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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