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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02bb76b8d9ce016eb2ab9224ea412d250b2e4254c9940db165c908d3d9c007a3' 
  AND token = 'z4VnaHxhafX9W72QYJKKfg9iC6n6tizH3OQgo7rGq88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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