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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cab82c534929c6bd32da6283c54df191c51fd378dc1fa1ce0f7d7237e783fc3' 
  AND token = 'fIq5snerBZj/HrRzxzPMpBfV42nS9Hlv9lkLBI0zNjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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