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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540e523f63612d0435fe04c37955e36b725d3821d3e1390e358aaba48ab1ab00' 
  AND token = '2/qYuB2pAZwTBJCz28GHfAxfQIr4pJ328e46tXbnp04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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