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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef308911d39bbf62cc4ac0ac524d1cd75d03221592eac347c0bbe3d145b6d757' 
  AND token = 'rFORzs8RhCTV/RVPdf6Tjna/2Dj9ayW7CoXreBlQIGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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