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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9919aa4510caceee22927ce65e9bd3c9703802ca2b5c0b799d3ca71046efcad3' 
  AND token = 'qa+FpImlOiOkhl705vHxgEnQMtSfmf5CEJa5N1xurH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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