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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1959cfa026e784a7bd5e2307bb3ec66717a767c5b050f37810a193c4b663160' 
  AND token = 'wbwftFkLz+7TTCluRBkX2dgaIR46vV66m+Vhe4bUT4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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