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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010a793f220b62168bf7acc3e79892206ac531deed171d20caa5b9764a35f6e9' 
  AND token = '2sWzvHuygm0zVZwJxQF1mzjq9a2wjQ4S50L4UQTPm2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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