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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e82d5e8e48c968c0ab6846d837b804dc8fc82e576b5848b29fa337e01f2dd5' 
  AND token = '2DmrX7SiFppOfBSvHxtqx0diA50BU2sH+Dw9gBrSdDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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