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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6758882ba202959fbe02849f26b52dbf364162ed1388564d062bf45b0ba7ed81' 
  AND token = '244J9nq5et2hzwnY6omGFO5fEDM5Y4aT+SrZ+ZKDlgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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