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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3bd85cf53f73a3bab5931bb085d6fbe9363ab4f156d7acb25d97bbca95607ad' 
  AND token = 'k3ZWDcEnFPFzU16qv3rGNNaMkN2thsQ0xlGe8BwHnm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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