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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '958cb7762e4f7b109e7ee4785434b660948766fc2f89ca4d80a0c3c2d5f5827e' 
  AND token = 'r9NSg2pJAHyu7Zar85RzwlQmQ2VzgE+sJrZohSC7CD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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