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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630e8ad93935199e701f2ca2742274422dfc76c1ad6080571ed9e75b9d208b28' 
  AND token = 'gFs4I325qOKw2gCSG6chE1zmd+JBO8ewxprOVpv2CaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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