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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5912640e0ceddffd0f3f7d7112d38950459f6c4dfcb446fc113b93e703bcb2a1' 
  AND token = '6ckXhCg4zuKdl1g17/3jwymgSMni6bZ+gpcnyXDlDTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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