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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80b67e06886779aecbb44ecbfa05b52aaa3e53598040f6f025ec233f2e2ff7e' 
  AND token = 'rLNTIYgJBNkTvHVNJ4Oy7gRO9UDFay3IEN3FJ2tpKso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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