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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75184f6011b9ba54bb89e7593def71832506a7ff7c5789a902de534a86867d3e' 
  AND token = 'KM3xjHYAx9CAtRAo2bTUW1roHNNRtX7b5BHgOKAS7kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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