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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110f2b70450f1db48a7178a23d5d104668f7763cd28f2d79ac7e9630c3323142' 
  AND token = '7701pBhXQ7yLnQvO2ttGVT/PJtmBtn6TpURoWyWPuh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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