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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ffb73ce32da66084ab0a5ae13fe66e7ce28ff451fcdb540e3d07237fcd515b' 
  AND token = '0PVFLqc8+YhMkVva4e4WG1so6Rw1FJzeePs6ZoojS7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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