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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f326318a4e195b7318891a8d67ecb4863897cb103e05232ff2b88484a5b3e486' 
  AND token = 'tb6GWk96ibGkHTMn4K1k81XUighm+lgWoOBdzrfGBRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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