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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a2d788819fe66c1d15d735627ca1a4dab04c80a7856a926b7b7ca68fb13f910' 
  AND token = 'lH7UUdSKj2Egtjt0q9MPURd8X4Hesxo3LdaK+DSL7V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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