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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa0096d074d25115ec03c433eadce78f497fe3462259032c2d7de94ee090abd' 
  AND token = 'Qs831lFh2mjbS5ST7C8HT1zmLOvAOVFQxkbgfBOU0F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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