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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ad1f96182a6c16c5365dc2efa787a0e17dedb460e168521652a8c5ea76a4b6' 
  AND token = '+qzCWaAK1vDdaZySP2HWcNJ0EL9H5mxbyoii0ue1I3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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