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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4095e42ccd6e084bbeda361ecde6b78abf1227ce181159d92c7204bf276e257' 
  AND token = 'fjdz5K7xXle5oG74UvIpMcPfAb2ZAJAw0nvdjAXMNDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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